Were you able to get a solution to this? I have a project I'd like to implement (pay for someone to develop) and it depends on being able to alert by sms. Just wondering if you solved it? - thanks! Also, how do I find programmers on here who are available for hire?

I'm sure you've figured this out after 5 months, but for anyone having the same problem I'm pretty sure it's because alertcondition doesn't work if the script is a strategy. Only if it's a study (the relevant part is mentioned on line 2) - I'm not fully confident this is the case, but there's so like Pine script info available online I figured I'd try and contribute.